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From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear

Zausch, J. and Horbach, J. and Laurati, M. and Egelhaaf, S. U. and Brader, J. M. and Voigtmann, T. and Fuchs, M. (2008) From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear. Journal of Physics - Condensed Matter, 20, 404210/1-404210/13. DOI: 10.1088/0953-8984/20/40/404210.

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Abstract

We investigate stresses and particle motion during the start up of flow in a colloidal dispersion close to arrest into a glassy state. A combination of molecular dynamics simulation, mode coupling theory and confocal microscopy experiment is used to investigate the origins of the widely observed stress overshoot and (previously not reported) super-diffusive motion in the transient dynamics. A link between the macro-rheological stress versus strain curves and the microscopic particle motion is established. Negative correlations in the transient auto-correlation function of the potential stresses are found responsible for both phenomena, and arise even for homogeneous flows and almost Gaussian particle displacements.

Document Type:Article
Title:From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear
Authors:
AuthorsInstitution or Email of Authors
Zausch, J.Johannes-Gutenberg-Universität Mainz
Horbach, J.UNSPECIFIED
Laurati, M.Heinrich-Heine-Universität Düsseldorf
Egelhaaf, S. U.Heinrich-Heine-Universität Düsseldorf
Brader, J. M.Universität Konstanz
Voigtmann, T.UNSPECIFIED
Fuchs, M.Universität Konstanz
Date:2008
Journal or Publication Title:Journal of Physics - Condensed Matter
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:20
DOI:10.1088/0953-8984/20/40/404210
Page Range:404210/1-404210/13
Status:Published
Keywords:molecular dynamics, glass forming liquids under shear, confocal microscopy, mode coupling serie
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Ingeborg Parpart
Deposited On:21 Oct 2008
Last Modified:27 Apr 2009 15:08

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